Thanks for following this thread, VMarina.

I’m glad to know you’re considering upgrading your current QuickBooks Desktop for Mac 2019 to the 2021 version. I'll help and route you in the right direction about your concern.

You can either install QBDT for Mac 2021 first or OS Monterey. Make sure that your device meets the system requirements. This is to ensure it’s compatible with your setup and prevents unexpected issues during the installation process.

For additional resources, you can browse this article: Install and set up QuickBooks Desktop for Mac. It contains a link for the minimum system requirements for your Mac. You’ll also see the step-by-step process on how to upgrade or convert the company file.

To learn more about the latest enhancements for QuickBooks Desktop for Mac 2021, check this article: What's new in QuickBooks. Make sure to click the link to view the complete details of each feature.

Feel free to add a comment if you have any questions about installing the Mac program. I’ll jump right back in to answer them for you. Have a great rest of your day.